Buying from Amazon is fine - I've bought much high-end gear from them. The trick is it needs to say, "Shipped from and sold by Amazon.com." If not that, then the 3rd party vendor needs to be a trusted one. Adorama sells on Amazon, as do Norman Camera, Samy's Camera, etc., are all reputable. Many others are not, even some who happen to be Canon authorized dealers may sell gray market items without disclosure on Amazon.